iOS开发 小知识点
退回輸入鍵盤:
- (BOOL) textFieldShouldReturn:(id)textField{[textField resignFirstResponder]; }CGRect
CGRect frame = CGRectMake (origin.x, origin.y, size.width, size.height);矩形 NSStringFromCGRect(someCG) 把CGRect結構轉變為格式化字符串; CGRectFromString(aString) 由字符串恢復出矩形; CGRectInset(aRect) 創建較小或較大的矩形(中心點相同),+較小 -較大 CGRectIntersectsRect(rect1, rect2) 判斷兩矩形是否交叉,是否重疊 CGRectZero 高度和寬度為零的/位于(0,0)的矩形常量CGPoint & CGSize
CGPoint aPoint = CGPointMake(x, y); CGSize aSize = CGSizeMake(width, height);設置透明度
[myView setAlpha:value]; (0.0 < value < 1.0)設置背景色
[myView setBackgroundColor:[UIColor redColor]];(blackColor;darkGrayColor;lightGrayColor;whiteColor;grayColor; redColor; greenColor; blueColor; cyanColor;yellowColor;magentaColor; orangeColor;purpleColor;brownColor; clearColor; )自定義顏色:
UIColor *newColor = [[UIColor alloc] initWithRed:(float) green:(float) blue:(float) alpha:(float)]; 0.0~1.0寬度和高度
768X1024 1024X768 狀態欄高 20 像素高 導航欄 工具欄 44像素高隱藏狀態欄:
[[UIApplication shareApplication] setStatusBarHidden: YES animated:NO]橫屏:
[[UIApplication shareApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight]. orientation == UIInterfaceOrientationLandscapeLeft window=[[UIWindow alloc] initWithFrame:[UIScreen mainScreen] bounds];全屏自動適應父視圖大小:
aView.autoresizingSubviews = YES; aView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);定義按鈕
UIButton *scaleUpButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [scaleUpButton setTitle:@"放 大" forState:UIControlStateNormal]; scaleUpButton.frame = CGRectMake(40, 420, 100, 40); [scaleUpButton addTarget:self action:@selector(scaleUp) forControlEvents:UIControlEventTouchUpInside];設置視圖背景圖片
UIImageView *aView; [aView setImage:[UIImage imageNamed:@”name.png”]]; view1.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"image1.png"]];UISlider *slider = (UISlider *) sender; NSString *newText = [[NSString alloc] initWithFormat:@”%d”, (int)(slider.value + 0.5f)]; label.text = newText;活動表單 <UIActionSheetDelegate>
- (IBActive) someButtonPressed:(id) sender {UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:@”Are you sure?”delegate:selfcancelButtonTitle:@”No way!”destructiveButtonTitle:@”Yes, I’m Sure!”otherButtonTitles:nil];[actionSheet showInView:self.view];[actionSheet release]; }警告視圖 <UIAlertViewDelegate>
- (void) actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex {if(buttonIndex != [actionSheet cancelButtonIndex]){NSString *message = [[NSString alloc] initWithFormat:@”You canbreathe easy, everything went OK.”];UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@”Something was done”message:messagedelegate:selfcancelButtonTitle:@”OK”otherButtonTitles:nil];[alert show];[alert release];[message release];} }動畫效果
-(void)doChange:(id)sender { if(view2 == nil) { [self loadSec]; } [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:1]; [UIView setAnimationTransition:([view1 superview] ? UIViewAnimationTransitionFlipFromLeft : UIViewAnimationTransitionFlipFromRight)forView : self.view cache:YES];if([view1 superview]!= nil) { [view1 removeFromSuperview]; [self.view addSubview:view2];}else {[view2 removeFromSuperview]; [self.view addSubview:view1]; } [UIView commitAnimations]; }Table View <UITableViewDateSource>
#pragma mark - #pragma mark Table View Data Source Methods //指定分區中的行數,默認為1 - (NSInteger)tableView:(UITableView *)tableViewnumberOfRowsInSection:(NSInteger)section { return [self.listData count]; }//設置每一行cell顯示的內容 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *SimpleTableIndentifier = @"SimpleTableIndentifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:SimpleTableIndentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:SimpleTableIndentifier] autorelease]; }UIImage *image = [UIImage imageNamed:@"13.gif"]; cell.imageView.image = image;NSUInteger row = [indexPath row]; cell.textLabel.text = [listData objectAtIndex:row];cell.textLabel.font = [UIFont boldSystemFontOfSize:20];if(row < 5) cell.detailTextLabel.text = @"Best friends"; elsecell.detailTextLabel.text = @"friends"; return cell; }圖像:如果設置圖像,則它顯示在文本的左側
文本標簽:這是單元的主要文本(UITableViewCellStyleDefault 只顯示文本標簽)
詳細文本標簽:這是單元的輔助文本,通常用作解釋性說明或標簽
UITableViewCellStyleSubtitle UITableViewCellStyleDefault UITableViewCellStyleValue1 UITableViewCellStyleValue2<UITableViewDelegate> #pragma mark - #pragma mark Table View Delegate Methods //把每一行縮進級別設置為其行號 - (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath { NSUInteger row = [indexPath row]; return row; } //獲取傳遞過來的indexPath值 - (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSUInteger row = [indexPath row]; if (row == 0) return nil; return indexPath; }- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSUInteger row = [indexPath row]; NSString *rowValue = [listData objectAtIndex:row]; NSString *message = [[NSString alloc] initWithFormat:@"You selected %@",rowValue]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Row Selected" message:messagedelegate:nilcancelButtonTitle:@"Yes, I did!"otherButtonTitles:nil]; [alert show]; [alert release]; [message release]; [tableView deselectRowAtIndexPath:indexPath animated:YES]; }//設置行的高度 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { return 40; }隨機數的使用
頭文件的引用#import <time.h>#import <mach/mach_time.h>srandom()的使用srandom((unsigned)(mach_absolute_time() & 0xFFFFFFFF));直接使用 random() 來調用隨機數在UIImageView 中旋轉圖像
float rotateAngle = M_PI;CGAffineTransform transform =CGAffineTransformMakeRotation(rotateAngle);imageView.transform = transform;以上代碼旋轉imageView, 角度為rotateAngle, 方向可以自己測試哦!
在Quartz中如何設置旋轉點
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bg.png"]];imageView.layer.anchorPoint = CGPointMake(0.5, 1.0);這個是把旋轉點設置為底部中間。記住是在QuartzCore.framework中才得到支持。
創建.plist文件并存儲
NSString *errorDesc; //用來存放錯誤信息NSMutableDictionary *rootObj = [NSMutableDictionary dictionaryWithCapacity:4]; //NSDictionary, NSData等文件可以直接轉化為plist文件NSDictionary *innerDict;NSString *name;Player *player;NSInteger saveIndex;for(int i = 0; i < [playerArray count]; i++) {player = nil;player = [playerArray objectAtIndex:i];if(player == nil)break;name = player.playerName;// This “Player1″ denotes the player name could also be the computer nameinnerDict = [self getAllNodeInfoToDictionary:player];[rootObj setObject:innerDict forKey:name]; // This “Player1″ denotes the person who start this game}player = nil;NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:(id)rootObj format:NSPropertyListXMLFormat_v1_0 errorDescription:&errorDesc];最后2行可以忽略,只是給rootObj添加一點內容。這個plistData為創建好的plist文件,用其writeToFile方法就可以寫成文件。下面是代碼:
/*得到移動設備上的文件存放位置*/NSString *documentsPath = [self getDocumentsDirectory];NSString *savePath = [documentsPath stringByAppendingPathComponent:@"save.plist"];/*存文件*/if (plistData) {[plistData writeToFile:savePath atomically:YES];}else {NSLog(errorDesc);[errorDesc release];}- (NSString *)getDocumentsDirectory {NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);return [paths objectAtIndex:0];}讀取plist文件并轉化為NSDictionary
NSString *documentsPath = [self getDocumentsDirectory];NSString *fullPath = [documentsPath stringByAppendingPathComponent:@"save.plist"];NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:fullPath];讀取一般性文檔文件
NSString *tmp;NSArray *lines; /*將文件轉化為一行一行的*/lines = [[NSString stringWithContentsOfFile:@"testFileReadLines.txt"]componentsSeparatedByString:@”\n”];NSEnumerator *nse = [lines objectEnumerator];// 讀取<>里的內容while(tmp = [nse nextObject]) {NSString *stringBetweenBrackets = nil;NSScanner *scanner = [NSScanner scannerWithString:tmp];[scanner scanUpToString:@"<" intoString:nil];[scanner scanString:@"<" intoString:nil];[scanner scanUpToString:@">" intoString:&stringBetweenBrackets];NSLog([stringBetweenBrackets description]);}對于讀寫文件,還有補充,暫時到此。隨機數和文件讀寫在游戲開發中經常用到。所以把部分內容放在這,以便和大家分享,也當記錄,便于查找。
隱藏NavigationBar
[self.navigationController setNavigationBarHidden:YES animated:YES];在想隱藏的ViewController中使用就可以了。
如果無法保證子類行為的一致性,那么就用委托
If the subClass cann’t keep with superClass,use delegate rather than inheritance.
屏幕上看到的,都是UIVew
Everything you see on Screen is UIView.
如果對性能要求高,慎用Interface Build
if application’s performance is important,be discreet for the interface build.
copy是創建,retain是引用
the copy operation is create a new one,but the retain operation is just a reference.
alloc需要release,convenient不需要release
alloc method need corresponding release method,but convenient method not.
加載到NSArray/NSMutableArray里的對象,不需要負責release
The objects added to NSArray/NSMutableArray need not to be released.
IBOutlet,IBAction為你開啟了訪問Interface Build中對象的大門
IBOutlet and IBAction open the door to access the objects in Interface build.
UIApplicationDelegate負責應用程序的生命周期,而UIViewController負責View的生命周期
UIApplicationDelegate is responsible for the application life cycle,but UIViewController for the UIView.
為了程序的健壯性,請盡量實現Delegate的生命周期函數
if you want to develop a robust application,implement the life cycle methods as more as possbile.
you觸摸的不是UIEvent,而是NSSet的UIView
what you touch on screen is not UIEvent but UIView
UITextField不響應鍵盤:
方法1: TextField的的Touch Cancel響應中,添加[textFied resignFirstResponder];方法: - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{[textFied resignFirstResponder]; }更改響應鍵盤return按鈕:
TextField.returnKeyType=UIReturnKeyDone; select:UIReturnKeyDefault,UIReturnKeyGo,UIReturnKeyGoogle,UIReturnKeyJoin,UIReturnKeyNext,UIReturnKeyRoute,UIReturnKeySearch,UIReturnKeySend,UIReturnKeyYahoo,UIReturnKeyDone,UIReturnKeyEmergencyCall,尺寸問題:
iPhone應用程序圖標大小:57*57;iPhone全屏UIView大小:320*460 添加UITabBar后大小:320*411UITabelViewCell默認大小: 320*44繪制控件方法
//--alloc -(UITextField *)GetDefaultTextField:(CGRect)frame{UITextField *textField=[[UITextField alloc] initWithFrame:frame];textField.borderStyle=UITextBorderStyleRoundedRect;textField.font=[UIFont fontWithName:@"Arial" size:12.0];textField.textAlignment=UITextAlignmentCenter;textField.contentVerticalAlignment=UIControlContentVerticalAlignmentCenter;textField.keyboardType=UIKeyboardTypeNumbersAndPunctuation;textField.returnKeyType=UIReturnKeyDone;textField.delegate=self;return textField;} //--alloc -(UILabel *)GetDefaultLabel:(CGRect)frame{UILabel *label = [[UILabel alloc] initWithFrame: frame];label.textAlignment=UITextAlignmentCenter;label.textColor=[UIColor blackColor];label.backgroundColor=[UIColor clearColor];label.font=[UIFont boldSystemFontOfSize:12.0];return label; } //--alloc -(UIButton *)GetDefaultButton:(CGRect)frame{UIButton *button=[[UIButton alloc] initWithFrame:frame];[button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];[button setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted];[button setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];[button.titleLabel setFont:[UIFont boldSystemFontOfSize:14.0]];[button.titleLabel setLineBreakMode:UILineBreakModeCharacterWrap];[button addTarget:self action:@selector(btnTradeTouchUpInside:) forControlEvents:UIControlEventTouchUpInside];[button setContentHorizontalAlignment:UIControlContentHorizontalAlignmentCenter];[button setBackgroundImage:[UIImage imageNamed:@"png1.png"] forState:UIControlStateNormal];[button setBackgroundColor:[UIColor lightGrayColor]];button.tag=kButtonTag;return button;}多使用宏定義常量。tag,frame大小,一些判斷標志位。
#define kIndexValueTag 1蘋果屏幕截圖快捷鍵
一般在Mac上用Command-Shif-3/4來截圖。注:Command=蘋果鍵 其實還有幾個輔助鍵,來起到不同的截圖功能……
1)Command-Shift-3(適用于OS9,10.1X和10.2) 將整個屏幕拍下并保存到桌面。 2)Command-Shift-4(適用于OS9,10.1X和10.2) 將屏幕的一部分拍下并保存到桌面。當按下著幾個鍵后,光標會變為一個十字,可以拖拉來選取拍報區域。 3)Command-Shift-Control-3(適用于OS9和10.2) 將整個屏幕拍下并保存到剪貼板,可以Command+V直接粘貼到如Photoshop等軟件中編輯。 4)Command-Shift-Control-4(適用于OS9和10.2) 將屏幕的一部分拍下并保存到剪貼板。 5)Command-Shift-4再按空格鍵(適用于10.2) 光標會變成一個照相機,點擊可拍下當前窗口或菜單或Dock以及圖標等,只要將照相機移動到不用區域(有效區域會顯示為淺藍色)點擊。 6)Command-Shift-Control-4再按空格鍵(適用于10.2) 將選取的窗口或其他區域的快照保存到剪貼板。 7)Command-Shift-Capslock-4(適用于OS9) 將當前的窗口拍下并保存到桌面。 8)Command-Shift-Capslock-Control-4(適用于OS9) 將當前的窗口拍下并保存到剪貼板。 posted @ 2011-08-21 19:58 ccfzy 閱讀(510) 評論(0)?編輯 iphone用法大合集 摘要: 轉:http://blog.163.com/yonglike@yeah/blog/static/168299425201141743714116/1. stringWithFormat 用法: [NSString stringWithFormat:@"Hight: %d°%@ Low: %d°%@", [Temp],@"C",[lTemp],@"C"]; NSString to NSData:NSString* str= @"kilonet";NSData* data=[str dataUsin閱讀全文 posted @ 2011-08-21 17:59 ccfzy 閱讀(993) 評論(0)?編輯 NavigationController 上面添加按鈕兩種方法?
?
1:
self.navigationItem.leftBarButtonItem?= [[[UIBarButtonItem?alloc]?
? initWithBarButtonSystemItem:UIBarButtonSystemItemAction
? target:selfaction:@selector(ids:)] autorelease];
?
2:
UIBarButtonItem?*backButton = [[UIBarButtonItem?alloc]?initWithTitle:@"反饋"?style:UIBarButtonItemStylePlain?target:nil?action:nil];
self.navigationItem.leftBarButtonItem?= backButton;
?
[backButton?release];
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posted @ 2011-08-21 15:23 ccfzy 閱讀(200) 評論(0)?編輯 2011年6月27日 copy, tetain, assign , readonly , readwrite, nonatomic區別copy是創建一個新對象,retain是創建一個指針,引用對象計數加1。
1.readonly表示這個屬性是只讀的,就是只生成getter方法,不會生成setter方法.
2.readwrite,設置可供訪問級別
3.retain,是說明該屬性在賦值的時候,先release之前的值,然后再賦新值給屬性,引用再加1。
4.nonatomic,非原子性訪問,不加同步,多線程并發訪問會提高性能。先釋放原先變量,再將新變量retaii然后賦值;
? ? ??注意,如果不加此屬性,則默認是兩個訪問方法都為原子型事務訪問。
posted @ 2011-06-27 23:58 ccfzy 閱讀(89) 評論(0)?編輯 @property and @synthesize區別java的基礎理解的。
@property 相當于在java中的接口中使用,替代get ?set方法,沒有具體的方法操作。
@synthesize 相當于在java中的類中使用,替代get ?set方法,替代的是有方法的操作部分。
posted @ 2011-06-27 21:25 ccfzy 閱讀(32) 評論(0)?編輯轉載于:https://www.cnblogs.com/DamonTang/archive/2012/07/20/2601324.html
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